*{
    margin: 0;
    padding: 0;
    /*内减模式*/
    box-sizing: border-box;
}
li{
    list-style: none;
}
a{
    text-decoration: none;
}
.clearfix:before,.clearfix:after{
    content: " ";
    display: table;
}
.clearfix:after{
    clear: both;
}
body{
    background-color: #f3f5f7;
}
/*版心*/
.wrapper{
    width: 1200px;
    margin: 0 auto;
}
.header {
    height: 63px;
    /*background-color: pink;*/
    margin: 30px auto;
}
h1{
    float: left;
}
.nav{
    float: left;
    margin-left: 70px;
    height: 63px;
    /*background-color: green;*/
}
.nav li{
    float: left;
    margin-right: 26px;
}
.nav li a{
    display: block;
    padding: 0 9px;
    height: 63px;
    line-height: 63px;

    font-size: 18px;
    color: #050505;
}
.nav li a:hover{
    border-bottom: 2px solid #00a4ff;
}
.search{
    float: left;
    margin-left: 59px;
    width: 447px;
    height: 63px;
    border: 1px solid #00a4ff;
}
.search input{
    float: left;
    padding: 21px;
    width: 360px;
    height: 61px;
    border: 0;
}
.search input::placeholder{
    font-size: 16px;
    color: #bfbfbf;
}
.search button{
    float: left;
    width: 85px;
    height: 62px;
    background-image: url(../image/btn.png);
    border: 0;
}
.user{
    float: left;
    margin-left: 35px;
    height: 63px;
    line-height: 63px;
}
.user img{
    vertical-align: middle;
}